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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f189be730becabb464ac82534ddd98f104539af5a151740228fbf63ccf13cd5' 
  AND token = 'XW65rL4fHk/9NHbCk4Ax1ACOLq3h/nMAKH3I5x4g+MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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