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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8aacb0801728dad72dc2a98aec1a01fb93edb5834c9262f13bde0249989937' 
  AND token = 'po5jYfza9heQ6RgMitVnJgZ2OQxC7X1bnpi7gGXkHj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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