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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc171bf7a1201d5ce76771d53c805d6bc6ee19a0beb805620f5aeee34500e4c6' 
  AND token = 'AuGrobhhoqLETniGmBaPNBa9JYd+ehm6aiFpB0419Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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