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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9b29beff13382bada64cc092de9069df32eb6e46da82f7191a33c485717657' 
  AND token = 'FEO6SkaltR+53Q8oXyjdiEYu7/F5aojqSo8lNe7KyXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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