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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83216fd30d32623e3d04759ae64c342f25362b08271af988a631b433ed4bcfa9' 
  AND token = 't7X3iKH2MsXqrERjP1/e4MJoMM7+DhVnfR0hcZr+Yuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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