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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0e55a73b5e84bcad48abbfe7d2a4df20170045fe5b9dac90d3dff3198126a6' 
  AND token = '+UeB7SV5i4U51yxp5g44N3lfBlzPeXkrOV4KLZ1q5Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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