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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da0b4828b32201d3e8d581b31275b0199698f74eea4d6872a908dfb511e55c7' 
  AND token = '94R+ZYgHnNzH5h0Ad3Vcsepb3S0Z5a5WigCUSCRw+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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