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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8a736d061baeab23969ce4393cf455292ccbd630f0aa4b1b27d888bc7fb814' 
  AND token = 'p9wL/4+3295qQfFbjn1p4BVy433tiYkslyzBI2TTChY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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