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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c44caa6307045fb6e5b22450c81cac1d66c2d4c21051cd65c0441a9311d17de' 
  AND token = 'agCxZyIY1tJDGofjuQxVMRq+BA80VudpspggB9/Jjt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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