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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b061326eeffe3f1df033256fd97faa4a97e2e0c2f532b663008d2066410d97' 
  AND token = 'P3p2mVKV2yE/Lhrq6otsI+Po+PYCr4Z4wsEcif7wAhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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