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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9a4d2a1a282494bd3e294eaea36d13b0fa6ed6238fb94f924076bfe22f3cd9' 
  AND token = 'DnjxCoAcqhGeQ78ksCa3DKuMs4OkbC3B9A+ZWXR1pZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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