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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0bf4d0fa3ce12d58327e2b1a6d4cdb92a9eb258f5317cf725e4eecf7c8a45a' 
  AND token = 'PEpRZls1mc0WffLHlT1EZCqI048pSNeCQ3cYCNkW+Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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