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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3683f9d005ca907b47c65b756d6bd7ada3bf5d764c78ed88389daa124832fd' 
  AND token = 'TjCThsYvafySXNZ9lzLLYOZ2cNjbRl0AzdMYzpuEqU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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