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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51cffe7cbbfdd90049d37aa74a2b13b4b7e23e3046f38a40b2771ad08432f32' 
  AND token = 'aWg6aSJfWfD84jPoz9GpQDP5OmHof4cbyGgVnfKQqHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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