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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015cadc4ad8662adc95913909c57e50fce0835009753b8505e5b286d85e92871' 
  AND token = 'LGEg2vbWMLCSebPKgmnN3i4RHvIdJ2+z7ngfPBPFMrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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