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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658360daf4da2aed35afaa7292fbfddbab5679e24181934ac384ed33fa5867e3' 
  AND token = 'Cv3xv9l6ua6NyB27Vgk1Nptnu8wraGwkBPE3y7bhSBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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