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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce57ea4cb376aa2a2261016369b03c502c3154fda809f0e9da70a800c728f861' 
  AND token = '0fCNjHndUjBbWzwsJeiWgj8N0PK9PqMAMgNEjqOV4do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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