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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e371517261e85d4324a9cd6cde72577c275e0c28e5060fa1333a508473de5689' 
  AND token = 'kNZI1EE4lohWOV3AFCbL1SdrRh8HCets/YksSd0H4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}