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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd079831628a2e98f87c9a67b58c1faf07cc60332467efb21a53a345d8c22366' 
  AND token = '6T/dfhuoLoO22/ljV4cazqWM1HGBXw0lNr2VVCNojJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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