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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5ae9eabb446534abe1f889a65ea91fbfab9b4617cdef27f1745040e8ae08a3' 
  AND token = 'gTqcr4hXoGm23Je6C2ePMDEYn3klJQJQDw06DN91TDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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