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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f670cc465774e6b94fc58632c6c77acdef82b595f1d79337181b9ab4bb00497' 
  AND token = 'nn+2x3sXEVYR6Khf9LzaQVtchSdwPHrN0IH3tf1EDWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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