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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207a4b92f4c7ce21a597762a8fb149acc7a03e476616d564e2ca3a0296e7f0ea' 
  AND token = 'mIhRMMXjiW+b1SkvnHjU9N40luE7vRpuVYqMWU+hXYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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