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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811f5ad2e664b11259563c79c55324be21cac77f750f2936a55df8dfe7a0a8cb' 
  AND token = 'pW1eMZCEdg6q5uWJ7AsfJpYqniLEmdK3Vf6xNbQ6DKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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