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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73930a8c43c9304216834f3d3e59778a8f98a0b9b15c0b7fd17d48f123064a6e' 
  AND token = 'eC2EQQoltNKCKfTLENxbpfl4UufZfn05lLSDVY7aNpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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