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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd840fcb0287c6d0586c3f37fedf2f674a9c5133bac5e0a872da5ab44b3ffef' 
  AND token = 'QaSga5YD13KJt2fudcPsin3kdGJqmlQ8dhipPlKddsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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