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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e84b871e5ef8a29c6de3d3c3a0daa367ed44223471ad84cdb903ca388b2712' 
  AND token = 'tN4EbfU3Cn3wstNlUjZAYZcApBprTWPhsSiUZtYZ2zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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