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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3c567e864439ed2d8a8040d9905c6fba64390d29306a826c10e7e87618b10d' 
  AND token = '5yfUnDIO57rZGHUjpjQwXcYe1IHi1G4WepWdltkB16s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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