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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dfa64495b16aad707c71e0db0aaad926d5d6e3f930dd10250c4fe0fd748527' 
  AND token = 'gUsFpFNgjG1peZwZbPyizVEuHoxZgTwuK2OD/3MADok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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