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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc4786ef31dd170a1b57db40808c97c95bcf33f424aaae21646a5df20d4a948' 
  AND token = 'Zf8nBL8e02DW5fhBuaLkH168O9PSXIJoZl8YF2jGsQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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