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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdb3325f793d028775f6141b3e2b2fcd1d11ec9d37bc9fe1199dddac10cd68a' 
  AND token = 'Xkrrhz7BSTmn5BcRQ2pEul3kG1u5fOyvFtU1YuylI6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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