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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd101ce2467c688b6ff706d3dbd27a5658128ba7c6b2800bd35e4b33ad56f16ca' 
  AND token = '6m4ZSuTWv9L3i010+Io/0Wzyhx7zt9mweBeOPkkF5TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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