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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86faa40ccad5d7708ef89a59dfe150e5e5c678e3517eb48d3b04555865e44949' 
  AND token = 'mpl1A0d6BL2Djw6ydvWBoNYTq02tMs0Omsk6/+z2sJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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