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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca0ad1a1853db8fda33f98f14c74dc6de70ef5d47651a49257ad574870e2850' 
  AND token = 'w/gIWgWYR5IjEedWOZD/4gFFlswvsMI6NzzsBSOB5FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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