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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252102ae42efda5cbdec6117190ed5b0cadf8caf3776e660aacfc6702f77d729' 
  AND token = 'Mg7MBU3wJTYEZgBKL1z9XexSgRBuauC1SD9L/5vPMZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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