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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d7cb443308f4b00c839c06b52559599675761c0b24200deed82c9001c526a1' 
  AND token = 'PJ54Ib1x5aMMMdHvTKKINfTHhzXZ99LAyLZ7UD+1bhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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