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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cc1c3395726cc36185af5e0435308ea462aafd842348791c97c2b7ec16dd0c' 
  AND token = '2l4zq4SPxGiQdLyZX1dRJkFoFb/qM4eyUD5d4VTnSW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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