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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44b56454793bdd5916b4f7a1de201c3fccc3629031741208ba004056bbe6b9f' 
  AND token = '18Lq8GrK0381vW6Br7gCeT5BoJBGOKNhHr1/Svmp2uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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