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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3998c3c8a1f2d285bfad69ddc2786afb336e9bc63675bdaf2c676a1e7c6229' 
  AND token = 'VFHnGQvi5UgDdT15m7kSJltYtM3Ne/da/19qnsl84Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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