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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f54dbe4446814eee7a0ce4df6204a7d13a310924afc0067b54b94ad4a806b3' 
  AND token = 'uiCuHQeavbg7a52cUD9Uo19dG+QVx69YID87LwrFO8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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