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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5600044e370370f4a516ff0e504e47c96dd495cf5ef57656dac1507bcdf97c' 
  AND token = '4amIn+Un7J2L6GTP1RakueMIvrD2RL4KfN6YeefayLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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