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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca7462c9cf7a7045505e7eeeb35023e347e522549fb50d1934f3cbc05d8d14f' 
  AND token = '5Prnd71ELXur6mgMRu7zodHoHhUH/MfVC98UNMLZ0ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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