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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d59ea182b3a4d308fa8f63e3025e82993685454f5f3223e621b2665584df1a' 
  AND token = 'Ewexl4R3cfYJzL3tWEHsqyn7h/u0/rdRQwoo33becac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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