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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee485a1a7dfc9bfc6a247c9e29f8cd19db33ba16067ed7ede39401ac108c86b6' 
  AND token = 'LjI2uwdHw+7a6MmtK69xy5vh+c7QlBULa620GHv/ZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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