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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96438af25dbe75e5ad1906b06faaa50d6fc567d459d3f305e1c53c24f92efc63' 
  AND token = '1pIOuFOEAfDEbiwgpUjIhFzgcXsw8jHxUpXc8A7Y0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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