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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddde6bc85ea0b778bd5283189e1a0390eb31dbf374e8e641506d1bcfbb195391' 
  AND token = '6mTqnTIXzxqk3aKJA2sJgyxvjrI/CuNZPq1zdLnqUIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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