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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155148b591d63ac4655d2a964c9b033fdd44b40166333927903d7f352eb97022' 
  AND token = 'QLgyLy9VxZ3+LfGJcufgmpq9NCoL6dcsEcPgs+0L2CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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