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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451af7472ba3e973419ecbcbcdeb51346e78a1f8fe2c99daa3d92f53596dfcf9' 
  AND token = 'ub35VPBQvtkb85172VwgztEC0qLpsP/+mfMLEL3Ew3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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