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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcabd25dc96b6291d46a26459e55674c146bc3453e8a03c79c207073b2bb6af' 
  AND token = 'Gzwfuk2KMuZPRltT7tl957KlfGjBBnXLDHS5fMDH9Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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