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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ff22ec783401ee25b87d9057fc7c7651f74a0c117ed62ea85a2c1dcec2bb05' 
  AND token = '9cbz5NKmFop2eQn0idGF+yGUijCQ1uMh0a/+73Gf2n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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