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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950de3ac7a02e98ea82271e16ff24398988f6782859dd1af6d6a3a655af9be7b' 
  AND token = 'uLKYhkmVUnWfvMGmzMNN6vxN/tH9Aa/vIeQ/cwx3Tlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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